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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 01, 2019 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) renewal_option community shares	Jun. 30, 2019 USD ($) community	Dec. 31, 2019 community shares	May 19, 2020 shares	Jan. 01, 2020 shares	Feb. 01, 2019 USD ($)
Common shares of beneficial interest, shares issued (in shares) | shares		237,951,968		237,951,968		237,897,163	10,000
Gain on lease termination		$ 0	$ 0	$ 22,896	$ 0
Rental income		$ 488		782
Senior Living Communities
Payments to acquire assets	$ 49,155				49,155
Five Star
Total rental income recognized				$ 75,000
Monthly minimum rent payable									$ 11,000
Management fees as percentage of gross revenues		5.00%		5.00%
Percentage of annual incentive fee		15.00%		15.00%
Percentage of gross revenues realized at all communities		1.50%		1.50%
Number of consecutive renewal terms of agreement | renewal_option				2
Property management agreement, renewal term				5 years
Percentage target EBITDA of new management agreement not earned				90.00%
Percentage target EBITDA of new management agreement not earned for all communities				20.00%
Amount of improvements to communities					$ 86,288
Five Star
Annual rent plus percentage		4.00%		4.00%
Five Star | Senior Living Communities
Number of communities managed by related party | community				241	77
Five Star
Common shares of beneficial interest, shares issued (in shares) | shares								10,268,158
Five Star | Shareholders
Common shares of beneficial interest, shares issued (in shares) | shares								16,118,849
Five Star
Number of communities leased by the company | community						166
Number of communities managed by related party | community						78
Total rental income recognized			33,400		$ 72,713
Investment owned, percentage of total shares outstanding		33.90%		33.90%
Annual rent as a percentage				$ 538
Property management agreement expense		$ 15,262	$ 3,871	31,850	$ 7,660
Five Star | Rental income | Rents from significant lessee | Investment
Percentage of rental income			12.70%		13.80%
Five Star | Rental Property Concentration | Rents from significant lessee | Investment
Percentage of rental income					26.40%
Five Star | Rehabilitation Services
Expenses from transactions with related party		$ 5,814	$ 1,513	$ 13,871	$ 3,188

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